n_Fe2O3

\(n_{Fe_2O_3}=\dfrac{12}{160}=0,075\left(mol\right)\)

\(Fe_2O_3+3H_2\underrightarrow{t^0}2Fe+3H_2O\)

\(0,075\rightarrow0,225\)   \(0,15\)

\(V_{H_2}=0,225.22,4=5,04\left(l\right)\)

\(m_{Fe}=0,15.56=8,4\left(g\right)\)

Fe2O3+3H2-to>2Fe+3H2O

0,2----------0,6------0,4-----0,6 mol

n H2O=\(\dfrac{10,8}{18}\)=0,6 mol

=>VH2=0,6.22,4=13,44l

b)m Fe=0,4.56=22,4g

c) m Fe2O3=0,2.160=32g

\(m_{CuO}=50.20\%=10\left(g\right)\)

\(n_{CuO}=\dfrac{10}{80}=0,125\left(mol\right)\)

\(m_{Fe_2O_3}=50-10=40\left(g\right)\)

\(n_{Fe_2O_3}=\dfrac{40}{160}=0,25\left(mol\right)\)

PTHH :

  \(CuO+H_2\underrightarrow{t^o}Cu+H_2O\)

0,125   0,125   0,125 

\(Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\)

0,25        0,75    0,5 

\(a,V_{H_2}=\left(0,75+0,125\right).22,4=19,6\left(l\right)\)

\(b,m_{Cu}=0,125.64=8\left(g\right)\)

\(m_{Fe}=0,5.56=28\left(g\right)\)

PTHH: \(Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\)

a+b) \(n_{Fe}=\dfrac{22,4}{56}=0,4\left(mol\right)\)

\(\Rightarrow\left\{{}\begin{matrix}n_{Fe_2O_3}=0,2\left(mol\right)\\n_{H_2}=0,6\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{Fe_2O_3}=0,2\cdot160=32\left(g\right)\\V_{H_2}=0,6\cdot22,4=13,44\left(l\right)\end{matrix}\right.\)

c) PTHH: \(Zn+H_2SO_4\rightarrow ZnSO_4+H_2\uparrow\)

Theo PTHH: \(n_{Zn}=n_{H_2}=0,6\left(mol\right)\)

\(\Rightarrow m_{Zn}=0,6\cdot65=39\left(g\right)\)

a,

nFe = 22,4/56 = 0,4  (mol)

PTHH

Fe₂O₃ + 3H₂ ---t^o----) 2Fe + 3H₂O        (1)

theo phương trình (1) ,ta có:

nFe₂O₃ = 0,4 x 2 / 1 = 0,8 (mol)

mFe₂O₃ = 160 x 0,8 = 128 (g)

b,

theo pt (1)

nH₂ = (0,4 x 3)/2 = 0,6 (mol)

=) VH₂ = 0,6 x 22,4 = 13,44 (L)

c,

PTHH

Zn + H₂SO₄ -------------) ZnSO₄ + H₂                         (2)

Số mol H₂ cần dùng là 0,6 (mol)

Theo PT (2) :

nZn = nH₂    ==) nZn = 0,6 x 65 = 39 (g)

a, \(Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\)

b, \(n_{Fe}=\dfrac{22,4}{56}=0,4\left(mol\right)\)

Theo PT: \(n_{Fe_2O_3}=\dfrac{1}{2}n_{Fe}=0,2\left(mol\right)\Rightarrow m_{Fe_2O_3}=0,2.160=32\left(g\right)\)

c, \(n_{H_2}=\dfrac{3}{2}n_{Fe}=0,6\left(mol\right)\Rightarrow V_{H_2}=0,6.22,4=13,44\left(l\right)\)

d, \(2H_2+O_2\underrightarrow{t^o}2H_2O\)

Theo PT: \(n_{O_2}=\dfrac{1}{2}n_{H_2}=0,3\left(mol\right)\Rightarrow V_{O_2}=0,3.22,4=6,72\left(l\right)\)

\(\Rightarrow V_{kk}=\dfrac{V_{O_2}}{20\%}=33,6\left(l\right)\)

a)

$Fe_2O_3 + 3H_2 \xrightarrow{t^o} 2Fe + 3H_2O$

b) $n_{Fe} = \dfrac{22,4}{56} = 0,4(mol)$

Theo PTHH : $n_{Fe_2O_3} = \dfrac{1}{2}n_{Fe} = 0,2(mol)$
$m_{Fe_2O_3} = 0,2.160 = 32(gam)$

c) $n_{H_2} = \dfrac{3}{2}n_{Fe} = 0,6(mol)$
$V_{H_2} = 0,6.22,4 = 13,44(lít)$

d) $2H_2 + O_2 \xrightarrow{t^o} 2H_2O$
$V_{O_2} = \dfrac{1}{2}V_{H_2} = 6,72(lít)$
$V_{kk} = 6,72 : 20\% = 33,6(lít)$

a, PT: \(Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\)

Ta có: \(n_{Fe_2O_3}=\dfrac{8}{160}=0,05\left(mol\right)\)

\(n_{H_2}=3n_{Fe_2O_3}=0,15\left(mol\right)\Rightarrow V_{H_2}=0,15.22,4=3,36\left(l\right)\)

b, \(n_{Fe}=2n_{Fe_2O_3}=0,1\left(mol\right)\Rightarrow m_{Fe}=0,1.56=5,6\left(g\right)\)

a)n\(_{Fe_2O_3}\)=\(\dfrac{m_{Fe_2O_3}}{M_{F_2O_3}}\)=\(\dfrac{8}{160}\)=0,05(m)

PTHH  :  F\(_2\)O\(_3\)   +   3H\(_2\)    ➝     2Fe     +     3H\(_2\)O

tỉ lệ      :1                3                 2                 3

số mol:  0,05         0,15            0,1                0,15

 V\(_{H_2}\)=n\(_{H_2}\).22,4=0,15.22,4=3,36(l)

b) m\(_{Fe}\)=n\(_{Fe}\).M\(_{Fe}\)=0,1.56=5,6(g)

\(n_{Fe_2O_3}=\dfrac{m}{M}=\dfrac{8}{56.2+16.3}=0,05\left(mol\right)\) 

\(PTHH:Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\)

                  1             3         2          3

                0,05        0,15     0,1      0,15

a) \(V_{H_2}=n.24,79=0,15.24,79=3,7185\left(l\right)\) 

b) \(m_{Fe}=n.M=0,1.56=5,6\left(g\right).\)

\(n_{Fe_2O_3}=\dfrac{14.4}{160}=0.09\left(mol\right)\)

\(Fe_2O_3+3H_2\underrightarrow{^{t^0}}2Fe+3H_2O\)

\(0.09.........0.27...0.18\)

\(V_{H_2}=0.27\cdot22.4=6.048\left(l\right)\)

\(m_{Fe}=0.18\cdot56=10.08\left(g\right)\)

PTHH: \(FeO+H_2\longrightarrow Fe+H_2O\)

a/ \(n_{FeO}=\dfrac{m_{FeO}}{M_{FeO}}=\dfrac{14,4}{72}=0,2(mol)\)

\(\to n_{H_2}=0,2(mol)\)

\(\to V_{H_2}=0,2.22,4=4,48(l)\)

b/ \(n_{Fe}=n_{H_2}=0,2(mol)\)

\(\to m_{Fe}=0,2.56=11,2(g)\)

n F e 2 O 3 = 14.4 160 = 0.09 ( m o l ) F e 2 O 3 + 3 H 2 t 0 → 2 F e + 3 H 2 O 0.09.........0.27...0.18 V H 2 = 0.27 ⋅ 22.4 = 6.048 ( l ) m F e = 0.18 ⋅ 56 = 10.08 ( g )

\(n_{Fe_2O_3}=\dfrac{32}{160}=0.2\left(mol\right)\)

\(Fe_2O_3+3H_2\underrightarrow{^{^{t^o}}}2Fe+3H_2O\)

\(0.2........0.6........0.4........0.6\)

\(V_{H_2}=0.6\cdot22.4=13.44\left(l\right)\)

\(m_{Fe}=0.4\cdot56=22.4\left(g\right)\)

Số phân tử H₂O là : \(0.6\cdot6\cdot10^{23}=3.6\cdot10^{23}\left(pt\right)\)

a, \(n_{Fe_2O_3}=\dfrac{32}{160}=0,2\left(mol\right)\)

PTHH: 3H₂ + Fe₂O₃ ---t^o→ 2Fe + 3H₂O

Mol:      0,6       0,2                0,4      0,6

b, \(V_{H_2}=0,6.22,4=13,44\left(l\right)\)

c, \(m_{Fe}=0,4.56=22,4\left(g\right)\)

d, \(N=0,6.6.10^{23}=3,6.10^{23}\)   (phân tử)